Pressure sensor not reporting right value

[zzmike76]

hello

I noticed that my spartan sport wrist hr baro pressure readings are always wrong, constantly higher by 30/40 hPa. I made a raspberry weather station measuring different values (pressure, temp, humidity, etc) and strangely the values never match with the ones of the watch. I crosschecked the values against an official weather station nearby and can confirm that the watch is wrong

any hints?

[Dimitrios Kanellopoulos]

@zzmike76 its pressure at sea level not absolute pressure

[zzmike76]

mmmh…but if both sensors do report pressure in hPa, I thought it is pressure at sea for both?

[sartoric]

I check sometimes a weather station near here and it’s very close (sea level pressure of course)

Based on 4 stations around here (the nearest one is offline atm) I see
1014,2
1013,3
1012,6
1012,6
descending trend

and the watch says 1012

[General_Witt]

Last week I sent my s9 baro back in Finland to fix the barometer that registered pressure between 8 to 11 hPa higher than weather station around me at the same height above sea level.
Still waiting for an official response by Suunto assistance but I think some sensors are just defective.

[Dimitrios Kanellopoulos]

@zzmike76 nope. Suunto watches show sea level since they do know the altitude. You can add that to raspi I can help you convert it if you like

I would check the local weather station for his sea level pressure

[Dimitrios Kanellopoulos]

@General_Witt I pressume you checked the weather station sea level pressure not pressure. Weather stations might and will report both

[sartoric]

@zzmike76
You should be able to see the difference if you manually set reference altitude

[General_Witt]

@Dimitrios-Kanellopoulos
Of course. 3 different government ones. In one case I hiked till I was literally 1 meter away from the sensors. Still 8-9 hPa difference.

[Dimitrios Kanellopoulos]

@General_Witt very strange. WTF. Did you get the new unit back ?

[sartoric]

@General_Witt
Was the altitude correct?

[zzmike76]

@General_Witt @sartoric the altitude is correct in the watch (372 meters), but pressure always differs by at least 20/30 hPa, i guess the sensor has some issues

[Dimitrios Kanellopoulos]

Hey @zzmike76 may I know the location and the pressure raspi and S9 reports. I can check online for you

[Dimitrios Kanellopoulos]

@zzmike76 30hpa is a completly defective device. I do insist that one is looking at a different value.

[mario_b]

@zzmike76 on the ambit3 you can go into a service menu, to show the absolut pressure. (Maybe you can check that too on the S9)
When I got the watch, it was absolut perfect calibrated. When I first time did a hike, with Baro Mode altitude, the sea level pressure difference was exactly the difference of the weather change in this time of the hike. But the absolut pressure is spot on.

[General_Witt]

@Dimitrios-Kanellopoulos said in Pressure sensor not reporting right value:

@General_Witt very strange. WTF. Did you get the new unit back ?

I’m still in “received” status. They got the watch wednesday, I’m waiting for some response these days.
Anyway I tried both manual and auto altitude calibration with no avail.

[Dimitrios Kanellopoulos]

@General_Witt asking for you the CC

[zzmike76]

@Dimitrios-Kanellopoulos said in Pressure sensor not reporting right value:

the pressure raspi and S9 reports. I can check online for you

location is Würenlingen (Switzerland), raspi reports 975 hPa while watch 1019

[General_Witt]

@Dimitrios-Kanellopoulos said in Pressure sensor not reporting right value:

@General_Witt asking for you the CC

I’m sorry Dimitrios, I don’t know what CC is.

[Dimitrios Kanellopoulos]

@zzmike76 975 is too low for sea level pressure